This fix will be included in the 1.0.2 hotfix
if you go to the BuildPreview BP then go to the Get Overlapping Actors and make it look like this at the end.
If you go to the Player Building Component then go to the clear owners collapsed node and make it look like this
And the add owners collapsed nodes

if you go back to the BuildPreview bp then open the add non grid actor function and add this to the end.